adds darwin config to nix

modules/nix/default.nix

@@ -20,6 +20,32 @@
       programs.nix-ld.enable = true;
       nixpkgs.config.allowUnfree = true;
 
+      environment.systemPackages = with pkgs; [
+        nil
+        statix
+        manix
+      ];
+    };
+
+  flake.modules.darwin.nix =
+    { pkgs, ... }:
+    {
+      programs.direnv = {
+        enable = true;
+        silent = false;
+        loadInNixShell = true;
+        direnvrcExtra = "";
+        nix-direnv = {
+          enable = true;
+        };
+      };
+
+      nix.settings.experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
+      nixpkgs.config.allowUnfree = true;
+
       environment.systemPackages = with pkgs; [
         nil
         statix